Overfill Protection Devices for propane tanks now the law

All propane tanks must have OPD valves or they will not be refilled

Flame King 30LB Empty Steel Propane Tank LP Cylinder with Type 1 OPD Valve, for Grills and BBQs & Reviews - Wayfair Canada

Propane Tank Laws

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The Propane Industry and Recommendations for Scales

An RV Propane Tank Warning

Manchester Tank & Equipment 30 lb. Steel TC/DOT Vertical Propane Cylinder Equipped with OPD Valve, 1160TCTH.5 at Tractor Supply Co.

Flame King 5LB Empty Propane Tank LP Cylinder with OPD Valve for Camping and Portable Appliances & Reviews - Wayfair Canada

Flame King 20 lb. Empty Propane Cylinder with Overflow Protection Device and Built-in Gauge YSN230 - The Home Depot

Overfilling Prevention Device